It is sufficient to recieve one mail with *many* recipients and/or *many* attachments to start considering this a bug.

I know people how run announcement mail-lists and recipients list can run into *hundreds* names.

This is very serious usability problem. Corner cases might be handled poorly – but still they must be handled.

P.S. Attachments problem are even more serious. List of recipients can be somehow poorly seen with ‘View Source’, while attachements cannot be seen that way. And at moment ‘Save/Detach All’ feature is broken.